TP-Link Archer C5 up to 6.8 Web-based Management Interface cross site scripting

Summaryinfo

A vulnerability classified as problematic was found in TP-Link Archer C5 up to 6.8. This issue affects some unknown processing of the component Web-based Management Interface. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2026-8699. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in TP-Link Archer C5 up to 6.8. Affected is an unknown function of the component Web-based Management Interface. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

A stored Cross-Site Scripting (XSS) vulnerability has been identified in the web-based management interface of Archer C5 v6.8 routers, due to insufficient server-side validation and lack of proper output encoding of user-controlled input in a certain field.  An attacker with administrative privileges can inject crafted HTML or JS payloads into the affected field. The payload is stored and later executed when the affected page is rendered in an administrator's browser.Successful exploitation allows execution of arbitrary JavaScript in an admin's browser, potentially leading to session hijacking and unauthorized access to router configuration, possibly resulting in exposure of sensitive data and modification of device settings. The vulnerability affects ISP-managed firmware variants of the product. Remediation is coordinated through service providers.

The weakness was shared by Jithin Nambiar J. The advisory is shared for download at tp-link.com. This vulnerability is traded as CVE-2026-8699 since 05/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are needed for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• TP-Link

Name

• Archer C5

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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